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(ModeL) I. A. SHAW. COMBINATION LOOK. No. 404,568. Patented June 4,-1889.

INVENTOR ATTORNEYS.

UNITED STATES PATENT OFFICE.

IRVIN A. SHAWV, OF KINSLEY, KANSAS.

COMBINATION-LOCK.

SPECIFICATION forming part of Letters Patent No. 404,568, dated'June 4,1889. Application filed June 12, 1888. Serial No. 276,820. (ModeL) Toall whom it may concern.-

Be it known that I, IRVINA. SHAW, of Kinsley, in the county of Edwardsand State of Kansas, have invented a new and Improved Combination-Lock,of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improvedcombinationlock, which is very simple and durable in construction, andin which the operator is guided by the sound of aspring engaging aturning ratchetwheel.

The invention consists of certain parts and details and combinations ofthe same, as will be fully described hereinafter, and then pointed outin the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a face View of the improvement. Fig. 2 is a like View of thesame with the outer plate removed. Fig. 3 is a similar View with theinner plate removed. Fig. 4 is a sectional plan view of the same on theline or a: of Fig. 1, and Fig. 5 is a cross-section of the same on theline y g of Fig. 1.

The improved combination-lock A is provided with the usual locking-boltB, held .to slide in a suitably-constructed casing 0, consisting,principally, of a plate 0- fastened to door D, and of a casing O securedto the said plate 0. The outer end of the locking-bolt B is providedwith the bevel B, adapted to engage the removable catch-plate E, held toslide in the keeper E, secured to the doorjamb D. In the bottom edge ofthe lockingbolt B is formed a notch B which engages the end of a pin F,secured to the shaft G, mounted to turn in the casing O, and passingthrough the door D, carrying at its outer ends the usual door-knobs H.The outward movement of the pin F is limited by a stop-pin F secured tothe plate 0', and the inward. movement of the locking-boltB is limitedby a projection B formed on the bolt B and adapted to engage the saidstop-pin F. At the inner end ofthe bolt B is formed a projection B4, onwhich is coiled a spring I, resting with its outer end against thecasing O and with its other end against the said bolt B, so that thelatter is pressed outward by the spring I.

In the locking-bolt B are formed one or more transversely-circularopenings 13", 1n each of which is fitted to turn a tumbler J, providedwith a slot J, extending at one end to the periphery of the tumbler.Into this slot J fits the flat plate K, provided with a slight extensionK of the same size and form and adapted to pass into a slot 13, formedin the bolt B, and being a continuation of the circular opening B Theflat plate K is formed on the shaft K extending through an opening D inthe door D, to the outside of the latter, and having its bearing in theinner plate 0' of the casing O and in the outer plate C secured to theoutside of the doorD. On the outer end of the shaft K is secured a smallknob K On the other end of the flat plate K is formed a collar K, whichhas its bearingsin the casing 0 and from the said collar K projects thereduced shaft K which is threaded on its outer end, on which screwsasmall knob K similar to the knob K above mentioned.

On the inner part of the shaft K is fitted a ratchet-wheel L, the faceof which rests against the collar K and said wheel is secured on thesaid shaft K by screwing the knob K tightly against the said ratchet L,so that the latter is clamped on the collar K by the knob K, whereby thesaid ratchet-wheel L turns with the shaft K the plate K, and the shaft KThe teeth of the ratchet-wheel L are engaged by a spring N, secured byits end to a suitable post held 011 the casing 0 The ratchet- Wheels Land the springs N are inclosed in a covering plate or casing 0 securedto the outer plate 0 of the casing O, as is plainly shown in Fig. 4. Ineach ratchet-wheel several teeth are broken out, so as to form on theperiphery of the wheel a space L, as shown in Fig. 2.

The operation is as follows: The springs N permit their respectiveratchet-wheels L to be turned only in the direction of the. arrow a.

By making one complete revolution of the ratchet-wheel L the free end ofthe spring N comes in contact with the space L and then with the severalteeth. When the spring passes over the space L, no sound is heard fromthe outside; but when the spring passes over the several teeth the usualclick is heard. The number of teeth in the ratchet-wheel L is known tothe operator, and the ratchetwheel is set to any desired number ofteeth, counting from the space L in a forward direction, as indicated bythe arrow at. The ratchet-wheel is set by loosening the knob K or K andthen turning the shaft K so that the Hat part K assumes a certainrelative position to the slot B in the loeking bolt l3 that is, when,for instance, the ratchet-wheel ll, on the right-hand side of Fig. 2, isset to eleven teeth the plate stands in line with the slot B. The otherratehetwhcel L, at the left in Fig. 2, is set to six teeth, so that thecombination of the entire lock, as represented in the drawings, is setto six and eleven.

When the flat parts K and K are in the positions shown in Figs. 2, 3,and l, they register with the slots 13 and permit the "operator onturnin g the knob ll, to slide the bolt 13 forward or backward, so as toopen or close the door; but when the other knob K or K, turned from theinside or outside of the door, so that the respective springs N engageother teeth than 0 and 11 on the ratchet-wheels L, the flat parts K andKstand at an angle to the slots'li, and hence prevent the slidingmovement of the bolt ll. The door is then in a closed position, and thefront end 13 of the bolt 13 engages the catch E.

hen the operator desires to open the door from either the outside orinside after the ratchet-wheels L have been displaced, as abovedescribed, he first turns either the inside or,

outside knob K" or K until the click is no longer heardthat is, when thespring passes through the space L. Then the operator counts the numberof clicks until, on the left knobs K and K, he count-s six, and on theother knobs K and K on the right he counts eleven clicks, whichindicates that the ratchetwheels L and springs N stand in the positionshown in Fig. 2, and the Hat parts K and K of both shafts 1 also standin line with the longitudinal slots 13 of the locking-bolt l Theoperator can then turn the knobs ll so that the pin F of the shaft G,engaging the notch B of the locking-bolt 13, moves the latter inward,and the slot 1%passcs over the fiat part K.

\Vhen the operator releases the knob II, the spring I forces the bolt 13outward again, so that when the door is closed the beveled end '3 passesover and onto the catch E, after which the operator presses the saidknobs K5, so that the springs N engage different teeth of theratchet-wheel L, whereby the flat parts K and K are thrown into anangular position in relation to the slots B in the bolt B. The door isthen locked.

Thus it will be seen that the operator can set the ratchet-wheels L toany desired combination, and the door can be locked or nulocked fromeither the inside or the outside.

I do not limit myself to the special constructi on of the knob-shaft Gwith its pin 1", as other devieessuch as a slide-may be used to operatethe bolt 13. If there is no necessity for opening a door from theinside, then the inner knob ll is entirely dispensed with. For heavydoors I may make the bolts B double, and in order to complicate thecombination more tumblers may be added. If the catchplate E on theinside of the doorframe is removed, the door may be opened from theinside, which is necessary in case of fire and strangers who do not knowthe combination. The lock may be used in a mortise-lock as well as acaselock. i

Having thus fully described my invention, 1 claim as new and desire tosecure by Letters 'Patent 1. The combination, with a sliding bolt havinga 1011gitudinally-extendin slot and a circular opening communicatingwith the inner end of said slot, of a shaft having a flat part, acircular tumbler havin a slot receiving said flat part and turning insaid circular opening, whereby, when. said flat part and tumbler-slotare perpendicular to the boltslot, the bolt will be locked and whenturned fiatwise into the plane of the bolt-slot the bolt may beretracted, said tumbler sliding with the bolt, substantially as setforth.

2. In a combination-lock, the combination, with a locking-bolt providedwith a circular slot connecting with a longitudinal slot, of a shaftprovided with knobs and having a Hat part, a tumbler held on the saidflat partand fitting into the circular slot of the lockingbolt, aratchet-wheel held on the said shaft and turning with it, and a springengaging with its free end the teeth of the said ratchetwheel,substantially as shown and described.

In a eoi'nbinationdock, a locking-bolt provided with a circular slotcontinuing into a longitudinal slot, and a knob-shaft provided with apin for operating said lockingbolt, in combination with a shaft providedwith a knob on the inside and on the outside of the door, and alsohaving a flat part adapted to engage the longitudinal slot of the saidlocking-bolt, a slotted tumbler held on the said flat part and fittinginto the circular slot of the said locking-bolt, a ratchet wheel held onand turning with the said shaft and provided with a space in itsperiphery, said space being formed by the breaking out of several teeth,and a spring engaging with i free end the teeth and space of the said.ratchet-wheel, substantially as shown and described.

at. In a combination-lock, a locking-be] t provided with a circular slotcontinuing into a longitudinal slot, and a knob-shaft pro vided with apin for operating said lockingbolt, and a spring ,bearing against saidlocking-bolt, in combination with a shaft provided with a knob on theinside and on the outside of the door, and also having a flat partadapted to engage the longitudinal slot of the said locking-bolt, aslotted tumbler held on the said flat part and fitting into the space ofthe said ratchet-Wheel, substantially as shown and described.

IRVIN A. SHAWV.

Witnesses:

F. H. HANSON, H. F. BEST.

